package com.yesep.learn.netty.udp.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.util.CharsetUtil;

import java.net.InetSocketAddress;

public class UDPClient {
    static final int PORT = 8050;

    public static void main(String[] args) throws Exception {

        connect();
    }

    private static void connect() throws Exception{
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
                    .channel(NioDatagramChannel.class)
                    .option(ChannelOption.SO_BROADCAST, true)
                    .handler(new UDPClientHandler());

            Channel ch = b.bind(0).sync().channel();

            String str = "QOTM?";
            System.out.println("send:" + str);
            // Broadcast the QOTM request to port 8080.
            ch.writeAndFlush(new DatagramPacket(
                    Unpooled.copiedBuffer(str, CharsetUtil.UTF_8),
                    new InetSocketAddress("255.255.255.255", PORT))).sync();

            // QuoteOfTheMomentClientHandler will close the DatagramChannel when a
            // response is received.  If the channel is not closed within 5 seconds,
            // print an error message and quit.
            if (!ch.closeFuture().await(5000)) {
                System.err.println("QOTM request timed out.");
            }
        } finally {
            group.shutdownGracefully();
        }
    }

}
